1663898880 has 432 divisors, whose sum is σ = 6375317760. Its totient is φ = 368492544.

The previous prime is 1663898879. The next prime is 1663898893. The reversal of 1663898880 is 888983661.

It is a self number, because there is not a number n which added to its sum of digits gives 1663898880.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6961801 + ... + 6962039.

It is an arithmetic number, because the mean of its divisors is an integer number (14757680).

Almost surely, 2^1663898880 is an apocalyptic number.

1663898880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1663898880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3187658880).

1663898880 is an abundant number, since it is smaller than the sum of its proper divisors (4711418880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1663898880 is a wasteful number, since it uses less digits than its factorization.

1663898880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 57.

The square root of 1663898880 is about 40790.9166359375. The cubic root of 1663898880 is about 1184.9744230624.

The spelling of 1663898880 in words is "one billion, six hundred sixty-three million, eight hundred ninety-eight thousand, eight hundred eighty".